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That's why I install heads that come preassembled with check valves. It eliminates low head drainage and keeps all lines full of water (which greatly reduces the spitting of air you are referring to). Not to mention, it is a great water saving feature. Just think about all that water that just drains away! And if you're paying for it....WHOA!

Not sure what brand of head you have, but replacing the lowest head on the zone would help. Generally a head with a check valve will hold back the water up to 10-12 ft of vertical rise above the head.

Repair low head drainage? Hammering. Spitting air.

Hi, Need some advice please.
Had a new 10 zone Rain Bird system installed 2 weeks ago and we're just starting to use it.
1st issue is hammering. 5-10 seconds of pipes hammering when the first 5-6 zones come on/off.
2nd issue is low head draining. Installer didn't seem overly concerned about it and said the property slope will result in the lower heads draining.

When the zones come on they spit air for a minute or so before full water flow.
Is that normal-shouldn't the lines be pressurized and full of water for the most part?
Are all these issues all related?
Should I replace all heads heads with those that have check valves if these do not.
Thanks for any help.